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Draw to lines in your notebook line the ones below. What is true about the lines?

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THEY ARE PARALLEL. MARK THEM.

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Draw a transversal. A transversal is a line that intersects two other lines.

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Label the intersection points A & B.

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Draw another transversal that intersects B.

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What angles are equal in this picture? You do not have to write this down.

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Write this down. 1 5 since they are corresponding angles.

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Draw another transversal that intersect point B. What is a transversal again?

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Which angle is congruent to 9? Why?

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Which angle is congruent to 9? Why?

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9 11 since they are corresponding angles. Write this down.

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9 11 since they are corresponding angles. Mark this in your diagram.

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Are there other angles that are congruent?

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15 16 because they are vertical angles.

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What does this justify or prove? NCTMNCTM

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THE SUM OF THE ANGLES IN A TRIANGLE ADD TO 180

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Website regarding triangles http://argyll.epsb.ca/jreed/math9/strand3/3103.htm http://www.ies.co.jp/math/java/geo/san180/san180.html Practice Problems: HW

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Triangles in Architecture

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New design for a building in London; has not been completed yet.

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Hearst Tower in Manhattan, New York

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Close up view of the Hearst Tower.

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The inside of a dome.

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Truss bridges use the triangle — a very stable shape — to distribute load forces.

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Howrah Bridge spans over the Hooghly River in West Bengal, India.

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The Little Belt Bridge also known as The Old Little Belt Bridge, is a truss bridge over the Little Belt strait in Denmark.

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The pyramids of Giza in Cairo, Egypt

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Unitarian Meeting House built by Frank Lloyd Wright in Madison, Wisconsin.

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Angle Relationships & Parallel Lines Pre-Algebra.

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